what we know is that bullets that actually pass from across the mid line, we call it, let me show you really quick. looking at a skull, going all the way from the right to the left, or from the left to the right, that tends to be a big problem because so much of the structures that control a person's ability to control their own heart race and respirations and that sort of stuff, that's sort of in that midline area. and that's what's so important. if it stays on one side of the brain, the left or right, the chances of surviving that are much, much higher, anderson. >> we're told she's in a medically induced coma. they removed an area of her skull. that's to reduce swelling, correct? >> that's right. you have to almost anticipate that there's going to be swelling here. and any time you have an injury to the brain like this you anticipate that. the thing with the brain, unlike other organs in the body on organs in your abdomen, if you have swelling you have room for them to swell.